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WO2015064782A1 - Système hydraulique d'un équipement de construction, ayant une fonction flottante - Google Patents

Système hydraulique d'un équipement de construction, ayant une fonction flottante Download PDF

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Publication number
WO2015064782A1
WO2015064782A1 PCT/KR2013/009751 KR2013009751W WO2015064782A1 WO 2015064782 A1 WO2015064782 A1 WO 2015064782A1 KR 2013009751 W KR2013009751 W KR 2013009751W WO 2015064782 A1 WO2015064782 A1 WO 2015064782A1
Authority
WO
WIPO (PCT)
Prior art keywords
hydraulic
hydraulic cylinder
float function
control valve
construction equipment
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2013/009751
Other languages
English (en)
Korean (ko)
Inventor
손영진
조준
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Volvo Construction Equipment AB
Original Assignee
Volvo Construction Equipment AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Volvo Construction Equipment AB filed Critical Volvo Construction Equipment AB
Priority to US15/032,686 priority Critical patent/US20160251830A1/en
Priority to CN201380080624.2A priority patent/CN105683451A/zh
Priority to EP13896202.2A priority patent/EP3064653A4/fr
Priority to PCT/KR2013/009751 priority patent/WO2015064782A1/fr
Publication of WO2015064782A1 publication Critical patent/WO2015064782A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2203—Arrangements for controlling the attitude of actuators, e.g. speed, floating function
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/36—Component parts
    • E02F3/42—Drives for dippers, buckets, dipper-arms or bucket-arms
    • E02F3/425—Drive systems for dipper-arms, backhoes or the like
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
    • E02F3/80—Component parts
    • E02F3/84—Drives or control devices therefor, e.g. hydraulic drive systems
    • E02F3/844—Drives or control devices therefor, e.g. hydraulic drive systems for positioning the blade, e.g. hydraulically
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/20—Drives; Control devices
    • E02F9/22—Hydraulic or pneumatic drives
    • E02F9/2278—Hydraulic circuits
    • E02F9/2285—Pilot-operated systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
    • E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
    • E02F3/32—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom working downwardly and towards the machine, e.g. with backhoes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F3/00—Dredgers; Soil-shifting machines
    • E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
    • E02F3/76—Graders, bulldozers, or the like with scraper plates or ploughshare-like elements; Levelling scarifying devices
    • E02F3/7609—Scraper blade mounted forwardly of the tractor on a pair of pivoting arms which are linked to the sides of the tractor, e.g. bulldozers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/3056—Assemblies of multiple valves
    • F15B2211/30565—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve
    • F15B2211/3058—Assemblies of multiple valves having multiple valves for a single output member, e.g. for creating higher valve function by use of multiple valves like two 2/2-valves replacing a 5/3-valve having additional valves for interconnecting the fluid chambers of a double-acting actuator, e.g. for regeneration mode or for floating mode
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/71—Multiple output members, e.g. multiple hydraulic motors or cylinders
    • F15B2211/7114—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators
    • F15B2211/7128—Multiple output members, e.g. multiple hydraulic motors or cylinders with direct connection between the chambers of different actuators the chambers being connected in parallel

Definitions

  • the present invention relates to a hydraulic device for construction equipment with a float function, and more particularly, to the hydraulic element by allowing the work function to be lowered without a float valve when the floating function switch is operated for flat work or stop work at the construction site. And it relates to a hydraulic device for construction equipment having a float function that can improve the cost-saving effect.
  • construction equipment including excavators or dozers are used for flattening or stopping work at the construction site, and the excavator should lower the boom so that the bucket contacts the ground, and the dozer equipment is mounted on the arm or tilt arm.
  • the blade device must be driven to the ground.
  • Korean Patent Publication No. 2010-0134827 discloses a technology related to a hydraulic system for construction equipment that can implement a float function to perform a flat stop operation.
  • This technology has a logic poppet to hold the inside of the float valve to perform a flat operation by using an excavator, and the hydraulic pressure to joint the valve and the valve by integrating the float and holding valve It is proposed to simplify the structure of piping.
  • the above-described conventional technique requires a float valve separately for the float function, and the float valve must be configured between the hydraulic cylinder for the work device and the hydraulic control valve.
  • the doser blade is lowered to contact the ground for flattening or stopping operation by operating a float valve installed between the hydraulic cylinder of the doser blade and the hydraulic control valve for the work machine when the float function switch is operated. .
  • the float valve when a construction machine including an excavator or a doser performs a float function, the float valve must be configured between a boom cylinder or a dozer blade cylinder, which is a work device, and a hydraulic control valve, and thus, hydraulic elements related to the float valve. There is a problem that causes an increase in cost and a rise in cost.
  • the present invention was created to solve the above problems,
  • Float function of work equipment including boom or dozer blade without the need of float valve provides hydraulic equipment for construction equipment with float function, which makes the manufacturing of hydraulic circuit and hydraulic piping compact and cost-saving. There is a purpose.
  • Another object of the present invention when the float function is operated by the pilot signal output through the remote control valve to open the flow path for the lowering of the work device is opened, the working oil of the hydraulic cylinder for the work device is returned to the hydraulic tank of the work device It is to provide a hydraulic device for construction equipment having a float function that can effectively perform the float function.
  • a remote control valve for outputting a pilot signal corresponding to the operation amount of the operation lever
  • a hydraulic cylinder for the work device connected to the hydraulic pump;
  • a main control valve installed in the discharge flow path of the hydraulic pump and controlling the start, stop and direction change of the hydraulic cylinder when the spool is switched;
  • a solenoid valve which is switched to an open position when the float function switch is turned on;
  • a two-stage port installed in a flow path between the main control valve and the hydraulic cylinder for the work device, and switched during operation of the float function switch to return the working oil of the large chamber of the hydraulic cylinder to the hydraulic tank so that the work device is lowered. It is achieved by providing a hydraulic device for construction equipment having a float function configured to include a relief valve.
  • the hydraulic device for construction equipment with a float function according to the present invention, wherein the hydraulic cylinder is composed of a boom cylinder, the two stage port relief valve, the remote control when the float function switch is operated It comprises a signal pressure port through which the pilot signal pressure is introduced through the valve, so that the float function is effectively achieved.
  • the hydraulic cylinder is composed of a hydraulic cylinder for the dozer blade device, the float function of the dozer equipment is effectively achieved.
  • the two-stage port relief valve is set to the minimum relief pressure by the pilot signal pressure to open the internal flow path, thereby operating oil of the hydraulic cylinder for the boom or dozer blade device for the float function Is returned to the hydraulic tank.
  • a remote control valve for outputting a pilot signal corresponding to the operation amount of the operation lever
  • a hydraulic cylinder for the work device connected to the hydraulic pump;
  • a main control valve installed in the discharge flow path of the hydraulic pump and controlling the start, stop and direction change of the hydraulic cylinder when the spool is switched;
  • a solenoid valve which is switched to an open position when the float function switch is turned on;
  • An on-off check valve installed in a flow path between the main control valve and the hydraulic cylinder for the working device, and returning the working oil of the small chamber of the hydraulic cylinder to the hydraulic tank so that the working device is lowered when the float function switch is operated; It is achieved by providing a hydraulic device for construction equipment having a float function configured to include.
  • Hydraulic device for construction equipment with a float function according to the present invention
  • the hydraulic device for construction equipment with a float function according to the present invention, the design of the hydraulic circuit and the hydraulic piping is compact and cost is reduced by performing the float function of the work equipment for construction machinery including a boom or dozer blade without a float valve It has the advantage of being.
  • FIG. 1 is a hydraulic circuit diagram schematically showing a hydraulic device for construction equipment with a float function according to an embodiment of the present invention
  • FIG. 2 is a hydraulic circuit diagram schematically showing a hydraulic device for a construction equipment having a float function according to another embodiment of the present invention
  • Figure 3 is an excerpt of the main portion of the hydraulic device for construction equipment with a float function according to another embodiment of the present invention
  • Figure 4 is a perspective view schematically showing an excavator having a hydraulic device for construction equipment with a float function according to the present invention
  • FIG. 1 is a hydraulic circuit diagram schematically showing a hydraulic device for construction equipment with a float function according to an embodiment of the present invention
  • Figure 2 is a hydraulic device for construction equipment with a float function according to another embodiment of the present invention
  • Figure 3 is a schematic hydraulic circuit diagram
  • Figure 3 is an excerpt of the main portion of the hydraulic device for construction equipment with a float function according to another embodiment of the present invention
  • Figure 4 is for construction equipment having a float function according to the present invention
  • reference numeral 1 is an excavator according to an embodiment of the present invention
  • 3 is an operating lever
  • 4 is a remote control valve
  • 5 is a hydraulic cylinder for a work device driven when the float function is activated
  • 10 is a solenoid valve
  • 12 schematically shows a two stage port relief valve.
  • the hydraulic device for construction equipment with a float function is applied to a construction machine including an excavator, a dozer or a grader for leveling or stopping work to level the ground, and grounding the work device in accordance with the activation of the float function.
  • a floating operation is made that keeps close to.
  • Hydraulic pump (1) for supplying the working oil for driving the work device, a remote control valve (4) for outputting a pilot signal corresponding to the operation amount of the pilot pump (2) and the operating lever (3), the hydraulic pump (1)
  • the main control valve is installed in the hydraulic cylinder (5) for the working device connected to the working device and the discharge flow path (6) of the hydraulic pump (1), and controls the start, stop and direction change of the hydraulic cylinder (5) when switching the spool. It is comprised including (7).
  • the main control valve 7 may be built with a plurality of hydraulic control valves for driving the working device of the bucket or the arm.
  • the working cylinder hydraulic cylinder (5) may be composed of a pair of hydraulic cylinders (5a, 5b) for driving the lifting and lowering of the boom, in the case of dozer equipment, the dozer blade working device is required for the floating operation Bar may be configured as a hydraulic cylinder (5c), a more detailed description will be described later.
  • a float function switch 8 may be installed inside the cab, and when the driver's switch operation is performed, for controlling the opening and closing of the valve required for the floating operation.
  • An electrical or pilot signal can be output from the float function switch 8.
  • the solenoid valve 10 is switched to the open position when the float function switch 8 is turned on, and is switched to the closed position when the float function switch 8 is turned off.
  • the floating function can be activated by the switch-on operation of the driver's float function switch 8 and the floating function can be deactivated by the switch-off operation.
  • the solenoid valve 10 has a signal pressure port 19 and a remote control valve 4 to which a valve control signal is introduced at the time of operation of the float function switch 8 for valve opening and closing operations. It includes an internal flow path 18 for connecting the pilot signal pressure provided through.
  • the hydraulic device for construction equipment with a float function is provided in a flow path 11 between the main control valve 7 and the hydraulic cylinder 5 for the work device, and the float function switch 8 It is configured to include a two-stage port relief valve 12 for returning the hydraulic oil of the large chamber of the hydraulic cylinder (5) to the hydraulic tank so as to be switched during the operation of the lower working device.
  • the two stage port relief valve 12 comprises a signal pressure port 13 through which a pilot signal pressure is introduced through the remote control valve 4 upon operation of the float function switch 8.
  • the two stage port relief valve 12 is set to a minimum relief pressure by the pilot signal pressure to open the internal flow passage 14 when the float function on the work tool is performed or activated.
  • the hydraulic oil of the hydraulic cylinder (5) is returned to the hydraulic tank (15).
  • the opening degree of the valve can be switched to the minimum relief pressure state by the valve control signal, for example, the pilot signal pressure, from which the two stage port relief valve 12 is provided from the outside.
  • the two stage port relief valve 12 is set in advance. The set state is maintained at the maximum relief pressure, and the inner flow passage 14 is closed accordingly.
  • the relief valve for draining the hydraulic pressure to the hydraulic tank 15 when the hydraulic pressure exceeds the predetermined system pressure between the hydraulic cylinder (5) and the main control valve (7) when the work device is raised and lowered 16 may be further installed.
  • FIG. 2 is a hydraulic circuit diagram for explaining a state in which the hydraulic device for construction equipment with a float function applied to the dozer equipment according to another embodiment of the present invention.
  • the two stage port relief valve 10 may include a flow path between the main control valve 7 and the hydraulic cylinder 5 for the working device. 11 is installed in the neutral position of the main control valve 7 and is switched by the pilot signal pressure provided through the pilot solenoid valve 10 when the float function switch 8 is operated. It is configured to return the hydraulic oil of) to the hydraulic tank (15).
  • the solenoid valve 10 can be operated to provide a pilot signal pressure for opening and closing the valve when the float function switch 8 is operated in the neutral position of the main control valve 7. Yes you can.
  • the hydraulic device for construction equipment with a float function is installed in the flow path (11a or 11b) between the main control valve 7 and the hydraulic cylinder (5c) for the working device And an on-off check valve 23 for returning the hydraulic oil of the hydraulic cylinder 5c to the hydraulic tank 15 so that the working device is lowered when the float function switch 8 is operated.
  • the hydraulic cylinder 5c is used for raising and lowering the doser blade or for tilt driving.
  • the above-described two stage port relief valve 12 or the on-off check valve 23 is the hydraulic oil of the large chamber 17a or the small chamber 17b of the hydraulic cylinder 5 required according to the working device. It can be variously applied to return the to the hydraulic tank (15).
  • the driver When the driver deactivates the floating function, the driver can control the driving of the work device including the boom B after the float function switch 8 is operated in the OFF state.
  • the pilot pressure oil discharged from the pilot pump Pi passes through the pilot oil passage 2b. Switch the spool of the control valve (7).
  • the hydraulic oil discharged from the hydraulic pump 1 is supplied to the large chamber and the small chamber to the hydraulic cylinder 5 via the discharge passage 6 and the main control valve 7 to drive the work device.
  • the two stage port relief valve 12 according to the present invention is maintained at a predetermined maximum relief pressure and the internal flow passage 14 is shut off to maintain the valve closed state.
  • the hydraulic oil is supplied to the pair of hydraulic cylinders 5a and 5b for driving the boom, but the hydraulic cylinder 5c is independently used for other work devices requiring a floating function. Of course it can be driven.
  • the main control valve 7 When the float function is activated in accordance with the invention, the main control valve 7 is placed in a neutral state, such that the boom work device or dozer blade work device is adjacent to the ground in accordance with the operation of the float function switch 8. Can be lowered.
  • the driver operates the float function switch 8 installed in the cab 25 to perform the float function.
  • the pilot hydraulic oil discharged from the pilot pump 2 is supplied to the signal pressure flow path 22 through the remote control valve 4.
  • an electrical signal or a pilot signal for opening and closing the valve is applied to the signal pressure port 19 of the solenoid valve 10, so that the solenoid valve 10 is internally provided.
  • the flow path 18 is switched to the open position.
  • the signal pressure of the pilot hydraulic oil supplied to the signal pressure passage 22 through the remote control valve 4 is connected to the signal pressure port of the two stage port relief valve 12 through the internal passage 18 of the solenoid valve 10. 14 is provided.
  • the internal flow passage 14 of the two stage port relief valve 12 is switched to the open position by the pressure by the pilot hydraulic oil supplied to the signal pressure port 13.
  • the hydraulic pressure of the hydraulic cylinder (5) for the work device is returned to the hydraulic tank (15) via the return flow path 20 at the neutral position of the main control valve (7), accordingly the boom work device is a bucket (24) ) Is lowered adjacent to the ground for flattening and stopping work.
  • an on-off check valve 23 may be configured instead of the two stage port relief valve 12.
  • the signal pressure of the pilot hydraulic oil supplied to the signal pressure flow passage 22 through the remote control valve 4 is increased.
  • the solenoid valve 10 is supplied to the seat portion 14 of the on-off check valve 23 through the internal passage 18.
  • the on-off check valve 23 is opened so that the hydraulic pressure of the hydraulic cylinder 5 for the work device is at the neutral position of the main control valve 7 via the return flow path 20.
  • the hydraulic device for construction equipment with a float function when the float function is activated, the hydraulic cylinder for the work device by the two stage port relief valve 12 or the on-off check valve 23 By returning the hydraulic pressure of the hydraulic tank 15 is a smooth operation of the working device is made.
  • the hydraulic device for construction equipment with a float function is to control the simple hydraulic device so that the floating operation of the boom or dozer blade working device is performed to efficiently perform the flat work or stop work required in the construction site Very useful.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Operation Control Of Excavators (AREA)
  • Fluid-Pressure Circuits (AREA)

Abstract

La présente invention se rapporte à un système hydraulique d'un équipement de construction, ayant une fonction flottante, ledit système comprenant : une pompe hydraulique et une pompe pilote destinée à fournir de l'huile hydraulique pour le fonctionnement de l'équipement de construction ; une vanne de commande à distance destinée à transmettre un signal pilote correspondant à la quantité d'opérations d'un levier d'actionnement ; un vérin hydraulique de l'équipement de construction qui est raccordé à la pompe hydraulique ; une vanne de commande principale agencée sur le trajet de refoulement de la pompe hydraulique et commandant la mise en marche, l'arrêt et la conversion de direction du vérin hydraulique au moment de la conversion de bobine ; une électro-vanne qui doit être passée à une position d'ouverture au moment de l'opération d'activation d'un commutateur de fonction flottante ; et une soupape de sûreté d'orifice à deux étages agencée sur un trajet entre la vanne de commande principale et le vérin hydraulique de l'équipement de construction et transformée au moment du fonctionnement du commutateur de fonction flottante de sorte à renvoyer l'huile hydraulique de la grande chambre du vérin hydraulique au réservoir de fluide hydraulique, ce qui permet d'abaisser l'équipement de construction.
PCT/KR2013/009751 2013-10-30 2013-10-30 Système hydraulique d'un équipement de construction, ayant une fonction flottante Ceased WO2015064782A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US15/032,686 US20160251830A1 (en) 2013-10-30 2013-10-30 Hydraulic system of construction equipment, having float function
CN201380080624.2A CN105683451A (zh) 2013-10-30 2013-10-30 具有浮动功能的工程机械的液压系统
EP13896202.2A EP3064653A4 (fr) 2013-10-30 2013-10-30 Système hydraulique d'un équipement de construction, ayant une fonction flottante
PCT/KR2013/009751 WO2015064782A1 (fr) 2013-10-30 2013-10-30 Système hydraulique d'un équipement de construction, ayant une fonction flottante

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2013/009751 WO2015064782A1 (fr) 2013-10-30 2013-10-30 Système hydraulique d'un équipement de construction, ayant une fonction flottante

Publications (1)

Publication Number Publication Date
WO2015064782A1 true WO2015064782A1 (fr) 2015-05-07

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US (1) US20160251830A1 (fr)
EP (1) EP3064653A4 (fr)
CN (1) CN105683451A (fr)
WO (1) WO2015064782A1 (fr)

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WO2014115907A1 (fr) * 2013-01-24 2014-07-31 볼보 컨스트럭션 이큅먼트 에이비 Dispositif et procédé de commande de débit dans un engin de chantier
CN106149795B (zh) * 2016-08-24 2018-07-27 四川邦立重机有限责任公司 挖掘机动臂液压控制系统
CN106468062B (zh) * 2016-09-22 2018-09-11 柳州柳工挖掘机有限公司 具有推土铲浮动功能的挖掘机推土液压系统
CN110500343A (zh) * 2019-08-26 2019-11-26 柳州柳工挖掘机有限公司 挖掘机推土铲液压系统
GB202015847D0 (en) * 2020-10-06 2020-11-18 Caterpillar Work Tools Bv Automatic pressure release
CN117500986A (zh) * 2021-06-28 2024-02-02 斗山山猫北美公司 用于控制挖掘机和其他动力机器的系统和方法
CN113882444B (zh) * 2021-10-29 2023-03-14 徐州徐工挖掘机械有限公司 一种带有推土铲浮动功能的推土液压系统以及挖掘机
US12410574B2 (en) * 2022-08-22 2025-09-09 Deere & Company Ground compaction sensing system and method for a work machine
CN115748855B (zh) * 2022-12-16 2023-06-30 徐州徐工挖掘机械有限公司 一种挖掘机动臂浮动液压控制系统及控制方法

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JPH09287176A (ja) * 1996-04-23 1997-11-04 Kobelco Kenki Eng Kk 油圧シリンダのフローティング装置
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US20160251830A1 (en) 2016-09-01
CN105683451A (zh) 2016-06-15
EP3064653A1 (fr) 2016-09-07

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